If you're using another module, that can interact with it : make sure they are compatible.

To contact us :

Before sending us your requests: did you consult the documentation, the tutorial and the demo?Your answer may be there.

If it's a functional anomaly of the module :

first, update the module (see heading "Access to update" above)

If the problem persists, please provide us with clear and detailed information, so that we can understand and reproduce the behavior. We will need : your Dolibarr version, steps to reproduce and screenshots to support. Any incomplete request will be as much extra waiting time ...